Island



(No Model.)

G. W. STAFFORD. SHBDDING MECHANISM FOR LOOMS.

N0. 439,204. Patented Oct. 28, 1890.

INVENTOR.

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WITNESSES:

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UNITED STATES PATENT OFFICE.

GEORGE IV. STAFFORD, OF PROVIDENCE, RHODE ISLAND.

SHEDDlNG MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 439,204, dated October 28, 1890.

- Application filed March 17, 1890. Serial No. 344,106. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. STAFFORD, of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Shedding Mechanisms for Looms; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to the construction and operation of the dobbies employed for selecting the harnesses to be operated in looms.

In a dobby embodying my present invention the parts, excepting those pertaining to the pattern-carrier or cylinder-operating devices and the connections or devices intermediate the said carrier or cylinder and the hooks, whereby the latter are indicated, may be constructed and operated as in United- States Patent No. 388,318.

Figure l in the drawings shows, in side elevation, a dobby embodying my present invention and its Working-connection with the running part of the loom. Fig. 2 shows a front 'view, looking toward the end of the loom of the cam devices for operating the pattern- .carrier or cylinder.

The dobby has two side frames A, connected by bars, between which frames most of the working parts are held on shafts having bearings in each side frame. A rocker-shaft 79, held in bearings in the frame A, has a lever a attached to each end of it outside of the frames A, and the upperarms of these levers a are connected by rods d to the ends of a lifter-bar s, which lifter-bar 8 slides in slots t in the side frames A. The lower arms a of the levers a are in like manner connected by the rods cl to the lower lifter-bar s, which slides in slots t made in the side frames. A series of harness-levers G are hung on the shaft 0, held by its ends in the frames A, carrying on the parts that project into the dobby a series of j ack-levers fiwhich are pivoted at their centers to the harness-levers 0, one jack-lever to each harness-lever. The

zontally from their pivots, so that when held up by the pattern devices they will be up and clear of the lifter-bars 8s, and when not held up by the pattern devices their free ends will be let down, so that the lifter-bars s s as they slide out in the slots will catch the hooks o n their under side and draw them out, together with the jack-levers to which they are pivoted and the harness-levers holding the jacklevers.

The pattern carrier or cylinder B is held in bearings in the lever-arms 6, one of which is shown in Fig. 1, the other one of the pair on the other side of the dobby being like it, eX-

cept that the arm does not extend beyond the bearing of the pattern-cylinder. are attached to a shaft h, extending across the end of the dobby and having bearings in each side frame. The end of the arm 6 (shown in Fig. 1) is extended out beyond the pattern carrier or cylinder and connected bya link 2' with one end of the lever 01, which is pivoted on a stud n in the side frame below. The stud is placed near the middle of the lever 01., to the other end of which the push-harp, that turns the pattern-cylinder, is pivoted. The upper end of the bar 1) is recessed in its side to form a notch 0 to catch against one of the pins Q7, set in the cylinder for the purpose of turning it, the bar being held up against the pins by a spring 4'. The object of having the lever 01 to carrythe push-bar pinstead of pivoting said push-bar to the frame is to avoid the necessity of dropping the pattern-cylinder so low as otherwise would be necessary to accomplish the turning of it, for by this arrangement the push-bar p is carried up by the lever n to meet the cylinderBin its downward motion and turn it.

The needles that make-the connection between the hooks g and the pattern card or surface on-the carrier or cylinder are held at their lower ends in the guide-barj. The long needles y, that operate the upper hooks g, have another guide-bang" at the top thereof to assist in holding them in position, and the lower short needles y,that operate the lower hooks, are held at their upper ends by the guide-bar 7' In this dobby one of the pattern-cards l is used at one pick of the loom to indicate for the lower set of hooks, and at The arms the next pick to indicate for the upper set of hooks, or vice versa, there being two rows of holes in each cardone for each row of needles-therefore the pattern-cylinder is turned only at each alternate pick; but it is necessary for the pattern cylinder and cards to drop sufficiently to allow the needles to assume their proper positions at each pick, though the cylinder does not drop low enough to turn and present another card, excepting on each alternate pick. This mode of operation is secured by means of the double cam D, Fig. 2. This cam consists of an outer surface upon which the friction-roll w runs, and which does the raising of the pattern mechanism, and an inner surface on which the friction-roll w runs, which insures the downward motion of the pattern mechanism. The friction-rolls w w are secured to the connecting-rod e, which has its upper end pivoted to the lever-arm e. The cam D is mounted on a short shaft D,

, geared to the crank-shaf t F of the loom by the gears F and F so as to make one revolution for two turns of the crank-shaft and give two downward motions to the connecting-rod e at each turn of the cam. The downward movements are controlled by the depressions .2 z in the outer surface of the cam, and it will be seen that the depression ,2 is deeper than the depression .2. The lowest of these depressions .2 allows the pattern mechanism to fall far enough to cause the cylinder B to be turned by the bar 19; but the depression 2' only lets it down far enough to allow the needles y y to adjust themselves for the second indication on the same card.

An arrangement to allow the pattern-cylinder to be turned back, when necessary, consists of a rod 70, held in two side frames, to one end of which a curved linger on is fastened outside of the frame, and to the other end a handle 0, by which the rod can be turned in its bearings. When the handle 0 is turned up, the finger on will turn down and strike against the upper end of the push-bar p and throw it back clear of the pins, and the pattern-cylinder can be turned back as desired. An arm R, attached to the hub of the lever a,is connected by a rod H to the crankpin J, on the inner end of the shaft D. A

flat spring q is secured to an auxiliary arm q, fast on the shaft h, on the inside of the dobby-frame A. This spring q is extended up so as to rest on the pattern-cards Z as they are raisedby the pattern-cylinder, and press them down on the points that project through openings made in the card to receive them. This insures the proper position and retention of the cards during the reciprocating motion of the cylinder.

Having thus described my improvements, what I claim as my invention is 1. In combination, a series of harness-levers, jack-levers pivoted to said harness-levers, hooks pivoted to opposite ends of the jaclnleversdifters to engage with said hooks, a pattern-cylinder, means for imparting long and short movements thereto alternately, devices operating to turn the pattern-cylinder on the long movement, and intermediate devices'through which the pattern-cylinder determines the engagement of the hooks with the lifters, substantially as described.

2. A series of harness-levers, jack-levers pivoted to said harness-levers, hooks pivoted to opposite ends of the jack-levers, lifters to engage with said hooks, a pattern carrier or cylinder, means for imparting to said carrier or cylinder alternately long and short reciprocating movements, and devices operating to turn the pattern-cylinder on the long movement, in combination with a series of needles acting upon the hooks and in connection with the pattern. 7

3. A pattern carrier or cylinder, in combination with mechanism for imparting thereto alternately long and short reciprocating movements, and devices operating to turn the pattern-cylinder at each long movement, each face of the pattern carrier or cylinder being presented to the devices controlled thereby twice in succession, substantially as set forth.

4:. In combination with the pattern carrier or cylinder of a loom-shedding mechanism, a cam shaped to cause two reciprocating movements of the carrier or cylinder in one revolution of the cam, and to occasion one receding movement greater than the other, operative connections between the said cam and the carrier or cylinder, and devices for turning the latter on each long movement, substantially as specified.

GEO. XV. STAFFORD. Witnesses:

J. A. VIOKERY, BENJ. ARNOLD.

IOC 

